huashizng
Newbie level 6
Hi, now i am designing a charger for Li-battery using buck structure. i need to simulate the chip loop ac stability. so i want to model the Li-battery. my ideal is use a large capacitor(50F) and a small resistor to stead the battery. but such large capacitor will lead to unstability obviously. somebody told me i should use small capacitor(20uF). i don't know why i should do so? according i know,the equivalent capacitor of the battery is very very large, for example,1KF. who can tell me how should i model the Li-battery in the ac simulation?[/list]